Multi-distance phase retrieval with a weighted shrink-wrap constraint

Multi-distance phase retrieval with a weighted shrink-wrap constraint
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具有加权收缩包裹约束的多距离相位检索

DOI:
10.1016/j.optlaseng.2018.09.017
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发表时间:
2019-02
影响因子:
4.6
通讯作者:
Zhengjun Liu
Zhengjun Liu
中科院分区:
工程技术2区
文献类型:
--
作者:
Cheng Guo;Yixuan Zhao;Jiubin Tan;Shutian Liu;Zhengjun Liu

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多距离相位检索可通过一组散焦强度图案实现完整的波前恢复。然而,多距离相位检索的收敛速度受到停滞问题的限制,导致视觉观察的成像对比度较低。我们提出了一个加速方案来解决这个问题。施加收缩包裹约束以获得有效的支撑区域。在支持区域,采用加权反馈策略来加速收敛。在非支持区域,引入衰减项来消除冗余数据。通过这种组合约束,成像对比度和收敛速度都显着增强。仿真和实验证明了这种加速方案在无透镜成像系统中的有效性。该方法既可以减少实验数据采集的工作量,又可以减少计算量。
Multi-distance phase retrieval enables a full wavefront recovery with a set of defocused intensity patterns. However, the convergence speed of multi-distance phase retrieval is restricted by a stagnant issue, which leads to a low imaging contrast for visual observation. We propose an acceleration scheme to solve this problem. A shrink-wrap constraint is imposed to obtain an efficient support region. In support region, a weighted feedback strategy is used to speed up the convergence. In non-support region, an attenuated term is introduced to eliminate redundant data. With this combined constraint, imaging contrast and convergence speed are both enhanced observably. Simulations and experiments demonstrate the validity of this acceleration scheme in a lensfree imaging system. The proposed method can both reduce the workload of experimental data acquisition and computational load.
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